这是一个fft的IP核，安装要求为quartus6.0以上。解压安装后可在quartus里例化使用，元件主要为cyclone和stratix,最大支持1024点...

十进制计算机，实现十进制计数功能，简单可靠(vhdl)

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sub opercore USB CRC5 and CRC16 Modules //// //// //// //// //// //// Author: Rudolf Usselmann //// //// rudi@asics.ws //// //// //// //// //// //// Downloaded from: http://www.opencores.org/cores/usb/(sub opercore USB CRC5 and CRC16 Modules//////////////////////// Author: Rudolf Usselmann//////// rudi@asics.ws//////////////////////// Downloaded from: http://www.opencores.org/cores/usb/)

代码用两种方法设计了一个基于多相滤波的内插器，低通滤波器采用128阶凯撒窗，内插倍数32，并且给定信号范围，验证了内插器的正确性，画出了内插前后信号的频谱。(The code design the interpolator based on polyphase filter using two methods.The low pass filter is 128 order Caesar window and interpolation multiple is 32.I give the range of the signal to verify the interpolator and plot the spectrum of the signal before and after the interpolator. )

说明：  按键消抖,避免按键抖动造成信号误触发，增大按键输入的可靠性(Key jitter elimination, avoid key jitter caused by signal error trigger, increase the reliability of key input)

CAN总线的数据采集，FPGA到USB。verilog hdl语言。(CAN bus data acquisition, FPGA to the USB. verilog hdl language.)

16位右移位寄存器 下面描述的是一个位宽为16位的右移位寄存器，实际具有环形移位的功能，是在右移位寄存器的基础上将最低位的输出端接到最高位的输入端构成的。其功能为当时钟上升沿到达时，输入信号的最低位移位到最高位，其余各位依次向右移动一位。(16-bit right shift register The following description is a right shift register with a bit width of 16 bits. It actually has the function of circular shift. It is based on the right shift register, which connects the lowest bit output terminal to the highest bit input terminal. Its function is that when the rising edge of the clock arrives, the lowest displacement of the input signal reaches the highest position, and the rest of you move one bit to the right in turn.)

说明：  多通道连续声发射数据采集，每个通道最大5M，采用verilog编程，内部用状态机。(Multichannel continuous acoustic emission data acquisition, each channel up to 5M, using Verilog programming, internal state machine.)

本原代码中利用VHDL语言编写了RAM、FIFO、ROM等常用的存储和缓冲部件，完全的代码在ALTERA的FPGA上已经通过仿真测试，保证可用.-primitive code using VHDL prepared RAM, FIFO, ROM, and other commonly used storage and buffer components, complete code in the Altera FPGA simulation test has been passed to ensure that available.

pcf8563，在quartusII下VERILOG编写的数字时钟程序，8位数码管显示(pcf8563, written in quartusII VERILOG digital clock program, eight digital display)